Notify the county assessor within 30 days if you sell, move, or for any reason no longer qualify for homestead. Complete the notice-of-move form (PDF, 1MB).Form ST3, Certificate of Exemption. Purchaser: Complete this certificate and give it to the seller. To apply for Nonprofit Exempt Status, submit Form ST16, Application for Nonprofit Exempt Status Sales Tax (PDF). Fill out both of the attached exemption forms in this packet. Fill in the blanks below and go back to the instructions to make sure you do it correctly. Please review the instructions before completing. Include any applicable fees. Apply for property tax exemption online.